Mystery solved: All those who said the Shield .45 HAS ALWAYS BEEN A 2.0 are correct.

The original .45 was the first Shield with the upgraded trigger and grips and whatnot....the 9 and 40 were later redone in the 2.0 mode to catch up to the .45.

The fact that it doesn't have the roll mark is meaningless in terms of function...and I had it out over the weekend and it shoots just fine. Perhaps a bit better than fine.

Many thanks to all who commented. As always the folk on this board are the most knowledgeable and forthcoming of any gun board anywhere.

Now, who knows the going price for an M&P .45 compact, 1.0 with apex trigger upgrade and nightsights? That's my next gun.